There may be no single cause of bipolar disorder (aka manic depression). Instead, research indicates the causes of bipolar disorder are probably a combination of biochemical, genetic and environmental factors that may trigger and perpetuate the chemical imbalances in the brain.
Net worth: $829 million. Telecommunications mogul Strive Masiyiwa is widely regarded as the richest man in Zimbabwe and is one of the richest men in Africa with a net worth of more than US$800 million.
Oprah, Diddy Atop Richest African-Americans List. January 16, 2013 | Posted by ABS Staff. Tagged With: African American, Forbes list, Oprah Winfrey, Robert Johnson, Sean Diddy Combs, Tiger Woods. The queen of television, Oprah Winfrey is the richest African-American and one of the most lucrative brands in the world. Winfrey tops the inaugural Forbes list of the wealthiest black Americans. She is the only African-American billionaire on the Forbes 2012 billionaires list.